采用在材料熔融挤出共混过程中提高双螺杆挤出机螺杆转速的方法,研究了较高螺杆转速条件下双螺杆挤出机的机械剪切应力对聚丙烯(PP)/聚苯乙烯(PS)/三元乙丙橡胶(EPDM)共混材料力学性能的影响.结果表明:双螺杆挤出机的高剪切应力可促进PS颗粒的分散和界面结合力的增强,促使共混材料力学性能的改善.EPDM对PP/PS共混材料具有增容增韧作用,在220℃的挤出温度下,当螺杆转速由240 r/min提高至1 200 r/min时,其PP/PS/EPDM(质量比81/9/10)共昆材料的缺口冲击强度最高达22.0 kJ/m2.%The effect of high shearing stress of the twin screw extruder on the mechanical properties of PP/PS/EPDM blends was investigated by increasing the screw rotation speed during melt extruding process. The results showed that the high shearing stress of the twin screw extruder can accelerate the distribution of PS particles and enhance the interfacial bonding strength. The compatibility of PP/PS could be improved with the EPDM. In the extrusion temperature of 220℃ , when the screw rotation speed increased from 240 r/min to 1 200 r/min, the Izod impact strength of the PP/PS/EPDM (81/9/10 wt% ) blends was up to 22. 0 kJ/m2.
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